SuperCars: add battery support

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/supercars/SuperCarsConstants.java

@@ -4,6 +4,8 @@ import java.util.UUID;
 
 public class SuperCarsConstants {
 
+    public static final byte[] aes_key = new byte[]{(byte) 0x34, (byte) 0x52, (byte) 0x2A, (byte) 0x5B, (byte) 0x7A, (byte) 0x6E, (byte) 0x49, (byte) 0x2C, (byte) 0x08, (byte) 0x09, (byte) 0x0A, (byte) 0x9D, (byte) 0x8D, (byte) 0x2A, (byte) 0x23, (byte) 0xF8};
+
     public static final UUID SERVICE_UUID_FFF = UUID.fromString("0000fff0-0000-1000-8000-00805f9b34fb");
     public static final UUID CHARACTERISTIC_UUID_FFF1 = UUID.fromString("d44bc439-abfd-45a2-b575-925416129600");
     public static final UUID CHARACTERISTIC_UUID_FFF2 = UUID.fromString("d44bc439-abfd-45a2-b575-92541612960a");

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/supercars/SuperCarsCoordinator.java

@@ -60,7 +60,7 @@ public class SuperCarsCoordinator extends AbstractDeviceCoordinator {
 
     @Override
     public int getBatteryCount() {
-        return 0;
+        return 1;
     }
 
     @Override

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/supercars/SuperCarsSupport.java

@@ -1,5 +1,6 @@
 package nodomain.freeyourgadget.gadgetbridge.service.devices.supercars;
 
+import android.bluetooth.BluetoothGatt;
 import android.bluetooth.BluetoothGattCharacteristic;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ -15,9 +16,11 @@ import org.slf4j.LoggerFactory;
 import java.util.ArrayList;
 import java.util.UUID;
 
+import nodomain.freeyourgadget.gadgetbridge.deviceevents.GBDeviceEventBatteryInfo;
 import nodomain.freeyourgadget.gadgetbridge.devices.supercars.SuperCarsConstants;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.Alarm;
+import nodomain.freeyourgadget.gadgetbridge.model.BatteryState;
 import nodomain.freeyourgadget.gadgetbridge.model.CalendarEventSpec;
 import nodomain.freeyourgadget.gadgetbridge.model.CallSpec;
 import nodomain.freeyourgadget.gadgetbridge.model.CannedMessagesSpec;
@@ -28,6 +31,7 @@ import nodomain.freeyourgadget.gadgetbridge.model.WeatherSpec;
 import nodomain.freeyourgadget.gadgetbridge.service.btle.AbstractBTLEDeviceSupport;
 import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder;
 import nodomain.freeyourgadget.gadgetbridge.service.btle.actions.SetDeviceStateAction;
+import nodomain.freeyourgadget.gadgetbridge.util.CryptoUtils;
 
 public class SuperCarsSupport extends AbstractBTLEDeviceSupport {
     private static final Logger LOG = LoggerFactory.getLogger(SuperCarsSupport.class);
@@ -43,14 +47,19 @@ public class SuperCarsSupport extends AbstractBTLEDeviceSupport {
     @Override
     protected TransactionBuilder initializeDevice(TransactionBuilder builder) {
         builder.add(new SetDeviceStateAction(getDevice(), GBDevice.State.INITIALIZING, getContext()));
+        builder.notify(getCharacteristic(SuperCarsConstants.CHARACTERISTIC_UUID_FFF4), true); //for battery
+
         LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(getContext());
 
         IntentFilter filter = new IntentFilter();
         filter.addAction(COMMAND_DRIVE_CONTROL);
         broadcastManager.registerReceiver(commandReceiver, filter);
+        getDevice().setFirmwareVersion("N/A");
+        getDevice().setFirmwareVersion2("N/A");
 
         builder.add(new SetDeviceStateAction(getDevice(), GBDevice.State.INITIALIZED, getContext()));
         LOG.debug("name " + gbDevice.getName());
+
         return builder;
     }
 
@@ -67,6 +76,27 @@ public class SuperCarsSupport extends AbstractBTLEDeviceSupport {
         }
     };
 
+    @Override
+    public boolean onCharacteristicChanged(BluetoothGatt gatt,
+                                           BluetoothGattCharacteristic characteristic) {
+        super.onCharacteristicChanged(gatt, characteristic);
+        byte[] data = characteristic.getValue();
+        byte[] decodedData = new byte[0];
+        try {
+            decodedData = CryptoUtils.decryptAES(data, SuperCarsConstants.aes_key);
+        } catch (Exception e) {
+            LOG.error("Error while decoding received data");
+        }
+
+        if (decodedData.length == 16) {
+            GBDeviceEventBatteryInfo batteryEvent = new GBDeviceEventBatteryInfo();
+            batteryEvent.state = BatteryState.BATTERY_NORMAL;
+            batteryEvent.level = decodedData[4];
+            evaluateGBDeviceEvent(batteryEvent);
+        }
+        return true;
+    }
+
     @Override
     public void onNotification(NotificationSpec notificationSpec) {